[ GLSA 200704-18 ] Courier-IMAP: Remote execution of arbitrary code

[GLSA]

Gentoo Linux Security Advisory

Title: Courier-IMAP: Remote execution of arbitrary code (GLSA 200704-18)
Severity: high
Exploitable: remote
Date: April 22, 2007
Updated: April 23, 2007
Bug(s): #168196
ID: 200704-18

Synopsis

A vulnerability has been discovered in Courier-IMAP allowing for remote code execution with root privileges.

Background

Courier-IMAP is an IMAP server which is part of the Courier mail system. It provides access only to maildirs.

Affected Packages

Package: net-mail/courier-imap
Vulnerable: < 4.0.6-r2
Unaffected: >= 4.0.6-r2
Unaffected: < 4.0.0
Architectures: All supported architectures


Description

CJ Kucera has discovered that some Courier-IMAP scripts don't properly handle the XMAILDIR variable, allowing for shell command injection.

Impact

A remote attacker could send specially crafted login credentials to a Courier-IMAP server instance, possibly leading to remote code execution with root privileges.

Workaround

There is no known workaround at this time.

Resolution

All Courier-IMAP users should upgrade to the latest version: